performance of potassium bicarbonate and calcium chloride draw solutions for desalination of saline water using forward osmosis

Authors

m. nematzadeh

a. samimi

s. shokrollahzadeh

a. behzadmehr

abstract

forward osmosis (fo) has recently drawn attention as a promising membrane based method for seawater and brackish water desalination. in this study, we focus on the use of calciun chloride (cacl2) and potassium bicarbonate (khco3) as inorganic salt draw solution candidates due to their appropriate performance in water flux and reverse salt diffusion as well as reasonable cost. the experiments were carried at 25 °c and cross-flow rate of 3 l min−1.  at the same osmotic pressure, the water flux of cacl2 draw solution tested against deionized feed water, showed 20% higher permeation than khco3, which it was attributed to the lower internal concentration polarization (icp). the reverse diffusion of cacl2 was found higher than khco3 solution which it would be related to the smaller ionic size and the higher permeation of this salt through the membrane. the water flux for both draw solutions against 0.33 m nacl feed solution was about 2.8 times lower than deionized feed water because of icp. higher concentrations of draw solution is required for increasing the water permeation from saline water feed towards the draw side.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

Performance of Potassium Bicarbonate and Calcium Chloride Draw Solutions for Desalination of Saline Water Using Forward Osmosis

Forward osmosis (FO) has recently drawn attention as a promising membrane based method for seawater and brackish water desalination. In this study, we focus on the use of calciun chloride (CaCl2) and potassium bicarbonate (KHCO3) as inorganic salt draw solution candidates due to their appropriate performance in water flux and reverse salt diffusion as well as reasonable cost. The experiments we...

full text

Blended fertilizers as draw solutions for fertilizer-drawn forward osmosis desalination.

In fertilizer-drawn forward osmosis (FDFO) desalination, the final nutrient concentration (nitrogen, phosphorus, potassium (NPK)) in the product water is essential for direct fertigation and to avoid over fertilization. Our study with 11 selected fertilizers indicate that blending of two or more single fertilizers as draw solution (DS) can achieve significantly lower nutrient concentration in t...

full text

Forward osmosis: Novel desalination of produced water and fracturing flowback

Treatment and reuse of oil and gas (O&G) production wastewater in a cost-effective and environmentally sound manner is critical for sustainable industrial development and for meeting stringent regulations. High salinity, free and emulsified hydrocarbons, silts and clays released from producing formations, and process additives common in O&G drilling wastewater render many conventional treatment...

full text

Stimuli-responsive polymer hydrogels as a new class of draw agent for forward osmosis desalination.

Ionic polymer hydrogels with thermal responsive units are found to induce higher water permeation rates in the osmosis process, and higher water release rates under a combination of pressure and thermal stimuli. These hydrogels have the potential for use as draw agent in forward osmosis desalination.

full text

Forward osmosis desalination using polymer hydrogels as a draw agent: influence of draw agent, feed solution and membrane on process performance.

We have previously reported the use of hydrogel particles as the draw agent for forward osmosis desalination. In the present work, the effects of draw agent, feed concentration and membrane on the process performance were systematically examined. Our results showed that the incorporation of carbon filler particles in polymer hydrogels led to enhanced swelling ratios of the draw agents and thus ...

full text

My Resources

Save resource for easier access later


Journal title:
transport phenomena in nano and micro scales

Publisher: university of sistan and baluchestan, iranian society of mechanical engineers

ISSN 2322-3634

volume 3

issue 1 2015

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023